MassBay Community College has established a scholarship in honor of Krystle Campbell, a 2005 graduate killed in the Boston Marathon bombings, MassBay said. The scholarship, set to be awarded this fall, will be given to a business major from Massachusetts who is taking a full course load and who submits an essay about resiliency, making a difference, generosity of spirit, or overcoming obstacles to achieve a goal. Campbell graduated from the school with an associate degree in business.